I think one of the best things you could do this winter is plant a walnut tree (if you’ve got the space). We’ve got one in our backyard and while I knew there was a walnut tree when we bought the house I don’t think I connected that with free walnuts.
I’m not sure how old ours is but I like to think it was planted when our house was built, so it’s 100. Walnut trees can grow to 300 years old so you’d be doing the people of the future a huge favour to plant one now.
I can also confirm that after a frustrating day, cracking walnuts beside the fire is fantastic stress relief.